Risk Analysis and ranking of sub-basins in order to locate LIDs for controlling urban flood (case study: district 10 and 11 of Mashhad)

Document Type : Research Paper

Authors

1 Department of Water Engineering, Ferdowsi University of Mashhad. Mashhad, Iran

2 Water Engineering Department, Ferdowsi University of Mashhad

Abstract

In this study, the surface water collection systems of districts 10 and 11 of Mashhad were modeled and evaluated using risk analysis. Sub-basins were also ranked in order to locate the implementation of low impact development (LID) practices. The results showed that although the collection system has no particular problem with floods with a two- year return period, it does not have a suitable capacity for floods with a higher return period, so that for floods with 5 and 50 years of return period, it has 80 percent discharge capacity of surface runoff and in these year returns, 29.1 and 38.2 percent of the canals, respectively, face waterlogging and back flow.

In order to final ranking of the sub-basin for prioritizing the location of LID practices, in addition to risk analysis, the sub-basins were classified based on economic priorities, social conditions and land use. The final ranking that 6.6% of the studied sub-basins, which includes 22.8% of the study area are in groups 4 and 5 (the highest Priority). Ranking puts areas with high flood risk under pressure to accept LID control and make an investment in it, as well as benefits areas where are at lower risk of flooding but are more likely to implement LID practices and invest in them.

Keywords


Volume 74, Issue 2
September 2021
Pages 373-392
  • Receive Date: 09 February 2021
  • Revise Date: 03 October 2021
  • Accept Date: 17 July 2021
  • First Publish Date: 23 August 2021